Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores
The Jan Mayen vent fields were discovered in the Mohns Ridge during an expedition with the Norwegian research vessel "G.O. Sars" in July 2005. They comprise two main active areas: (1) Soria Moria and (2) Gallionella Garden & Trollveggen. The Trollveggen vent field is located at depths...
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ftunivevora:oai:dspace.uevora.pt:10174/4168 2024-09-15T18:15:33+00:00 Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores Dias, Ágata Cruz, Inês Fonseca, Rita Barriga, Fernando Pederson, Rolf 2011-02 http://hdl.handle.net/10174/4168 eng eng EUROMARC DIAS, A., CRUZ, I., FONSECA, R., BARRIGA, F.J.A.S., PEDERSEN, R (2011) Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores. Final EuroMarc Conference, 7‐9 February 2011 http://hdl.handle.net/10174/4168 sim nao ascdias@fc.ul.pt inescruz@gmail.com rfonseca@uevora.pt fbarriga@fc.ul.pt Rolf.Pedersen@geo.uib.no 398 openAccess hydrotermal activity hydrotermal chimneys mineralogy and geochemistry sediment cores lecture 2011 ftunivevora 2024-07-11T03:37:57Z The Jan Mayen vent fields were discovered in the Mohns Ridge during an expedition with the Norwegian research vessel "G.O. Sars" in July 2005. They comprise two main active areas: (1) Soria Moria and (2) Gallionella Garden & Trollveggen. The Trollveggen vent field is located at depths of 700-750 m. Venting takes place mainly through white smoker chimneys with fluid temperatures reaching up to 260-270°C. Here we present mineralogical and geochemical data from vent chimneys and near vent deposits collected at the Trollveggen vent field with an ROV. Cross-sections of chimneys present evident mineralogical zonation, showing acicular barite crystals in the outer parts and sulphide enrichments in the interior (Sph + Cpy +/- Py - Po). The near vent deposits are mainly formed by vent fragments, showing a mineral assemblage similar to that of chimneys. Total geochemical analyses both from vents and near vent deposits showed higher concentrations in Ba, Co, Zn, Fe, but also slight enrichments in Au and Ag. REE patterns from chimneys and near vent deposits suggest that REE have been deposited from hot (> 250ºC) hydrothermal fluids. Sediment cores collected in the vicinity of the Jan Mayen hydrothermal field suggests that hydrothermal activity is not restricted to the known vent areas. Two of the collected gravity cores registered geochemical signatures related with hydrothermal activity, showing metal enrichment and a slightly positive Eu anomaly. Lecture Jan Mayen Repositório Científico da Universidade de Évora |
institution |
Open Polar |
collection |
Repositório Científico da Universidade de Évora |
op_collection_id |
ftunivevora |
language |
English |
topic |
hydrotermal activity hydrotermal chimneys mineralogy and geochemistry sediment cores |
spellingShingle |
hydrotermal activity hydrotermal chimneys mineralogy and geochemistry sediment cores Dias, Ágata Cruz, Inês Fonseca, Rita Barriga, Fernando Pederson, Rolf Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores |
topic_facet |
hydrotermal activity hydrotermal chimneys mineralogy and geochemistry sediment cores |
description |
The Jan Mayen vent fields were discovered in the Mohns Ridge during an expedition with the Norwegian research vessel "G.O. Sars" in July 2005. They comprise two main active areas: (1) Soria Moria and (2) Gallionella Garden & Trollveggen. The Trollveggen vent field is located at depths of 700-750 m. Venting takes place mainly through white smoker chimneys with fluid temperatures reaching up to 260-270°C. Here we present mineralogical and geochemical data from vent chimneys and near vent deposits collected at the Trollveggen vent field with an ROV. Cross-sections of chimneys present evident mineralogical zonation, showing acicular barite crystals in the outer parts and sulphide enrichments in the interior (Sph + Cpy +/- Py - Po). The near vent deposits are mainly formed by vent fragments, showing a mineral assemblage similar to that of chimneys. Total geochemical analyses both from vents and near vent deposits showed higher concentrations in Ba, Co, Zn, Fe, but also slight enrichments in Au and Ag. REE patterns from chimneys and near vent deposits suggest that REE have been deposited from hot (> 250ºC) hydrothermal fluids. Sediment cores collected in the vicinity of the Jan Mayen hydrothermal field suggests that hydrothermal activity is not restricted to the known vent areas. Two of the collected gravity cores registered geochemical signatures related with hydrothermal activity, showing metal enrichment and a slightly positive Eu anomaly. |
format |
Lecture |
author |
Dias, Ágata Cruz, Inês Fonseca, Rita Barriga, Fernando Pederson, Rolf |
author_facet |
Dias, Ágata Cruz, Inês Fonseca, Rita Barriga, Fernando Pederson, Rolf |
author_sort |
Dias, Ágata |
title |
Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores |
title_short |
Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores |
title_full |
Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores |
title_fullStr |
Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores |
title_full_unstemmed |
Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores |
title_sort |
trollveggen vent field: mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores |
publisher |
EUROMARC |
publishDate |
2011 |
url |
http://hdl.handle.net/10174/4168 |
genre |
Jan Mayen |
genre_facet |
Jan Mayen |
op_relation |
DIAS, A., CRUZ, I., FONSECA, R., BARRIGA, F.J.A.S., PEDERSEN, R (2011) Trollveggen Vent Field: Mineralogy and geochemistry of chimneys and deposits, and evidence of hydrothermal activity in far‐field cores. Final EuroMarc Conference, 7‐9 February 2011 http://hdl.handle.net/10174/4168 sim nao ascdias@fc.ul.pt inescruz@gmail.com rfonseca@uevora.pt fbarriga@fc.ul.pt Rolf.Pedersen@geo.uib.no 398 |
op_rights |
openAccess |
_version_ |
1810453394194694144 |